10 things that make pokemon popular

1 - 'Gotta catch 'em all' - keeps the person playing.
2 - New world concept - more new pokemon each time.
3 - Played by a wide variety of audiences
4 - Huge fanbase.
5 - Game can be portable.
6 - Some pokemon are cute for girls and others are tough for boys so appeals to a wider audience.
7 - Huge franchise including games, anime and merchandise.
8 - Good fun.
9 -  Simple concept.
10 - Not story based.